Roll-film box camera



June 13, 1933.4 M BALDEWEG 1,913,912

ROLL FILM BOX CAMERA Filed Dec. 16,'1931 Patented June 13,y 1933 UNITED STATES" MAX BALDEW'EG, 0F DRESDEN, `GERMANY BOLL-FILM Box CAMERA Application led December 16, 1931, Serial No. 581,435, and in Germany December 24, 1930.

I have filed applications in VGermany Dec.

24, 1930 and England Nov. 21, 1931.

The invention relates to roll-iilm box cameras having a box element removable from the casingv for the purpose of film changing and in some cases carrying the rear lens and extending forwards up to the objective wall of the outer shell, and which receives the film spool supports in indentations near its front lo `wall. Y

l Roll film cameras are already known in which about twice the exposures can he accommodated on a normal film. It was indeed also a roll-film box camera, but was of difw ferent construction and only answered this ,purpose and therefore does nt permit the production of larger pictures. On journeys it is however desirable to have both possibilities. According to the invention on or go in the picture area side of thev insertion box of the above-mentioned ordinary roll-film box camera is slid a removable plate with a picturearea of about one half or one third the height of t e normal picture area and the front wall of the insertion box is kept at such a distance from the front wall of the camera casing that the removable picture area wall can be stored there when not in use. For the purpose of more securely fastening a0 this removable picture area wall at right angles to its plane arebent lug-shaped extensionswhich clasp the longitudinal walls of "the insertion box. Although not necessary, it is nevertheless advantageous to allow the side walls of the insertion box to extend at the front side at such distance from each other that the picture area wall with its extensions also. clasps them. Thus any rattle is with certainty prevented. Both'the side walls and Vthe lugshaped extensibns of the picture area wall can be provided with projections and rests which suficiently secure the pic-ture area wall in its position relative to the'insertion box. This action can be increased further if, instead ofthe right-angle walls on the picture' area carrier, lugs of breadth are arranged, and guides for their reception are formed on the side walls of the insertionlbox by strips mounted thereon. If this device is provided near the rests or prosuiiicientjections, both are thus the more firmly held 1n engagement. These mounted strips at the same time take over the task of compensating for the play between insertion box and camera casing, especially if they are bent a little outwards so that they act yieldingly. Instead thereof howeverboth on the back side of the insertion element as well as on the front side'of the same projectionsor grooves can be stamped outwards, which Il!) in the latter case preferably lie within the picture area, as apparent from the drawing annexed.

In the drawing a constructionalexample of the invention 1s illustrated. Fig.*1 shows 'B5 a side view of the insertion element of a roll- [ihn box 'camera with a picture area wall slid thereon, Fig. 2 is a view in perspective of a picture area wall slide; and

Fig. 3 shows a modification ofthe fas-Y0 tening device. z

The side walls df the insertion box of the camera not otherwise illustrated are designated 1. They carry the inclined walls 2 as well as the film spool supports 3 which hold 75 the lm spools 4 in bulges 5. At the front of the end wall 6 there is usually also a rear lens 7. The pictugre area wall 8 with the icture area 9 has side rectangularly bent aps 10 which .may extend over the whole length 80 of the wall 8, but can naturally .also ybe shorter. To secure the wall 8, which is illustrated in Fig. 1 in full thick lines in the position for useandn/dotted illustration on the front wall of the insertion box, projections or rests 11a may be rovided. To increase thesecuring action o these securing means the laps 10 of the picture area wall may carry extensions 10a for the reception of which j serve stri s 12 or the like which likewise form situated within the picture area 9 if the picture area wall 8 is slid on there.

Having now particularly described and ascertained the nature of my said invention 5 and in what manner the same is to/be performed, I declare that what I claim 1s:

1. In a roll film box camera, the combination of a box-like insertion element formin a film roll carrier, of a plurality of mas 10 plates, and coasting means on said mask vplates and the front and rear of the insertion element for securing the mask lates selectively on the front and rear of t e insertion element. Y v 15 2. In a roll film box camera, the combination of a box-like insertion member having parallel side walls, of apluralit of mask plates; and flanges on the side e ges of the mask plates adapted to frictionally gri the 2P side walls at the front and rear ends o said insertion member whereby the mask plates may be selectively interchanged between said front and rear ends. 4

3. In a roll film box camera, the combina- 55 tion of a box-like insertion member having parallel side walls, of a plurality of mask plates, flanges on the side edges of the mask plates adapted to ,frictionally ip' the side walls at the front and rear en of said insertion member whereby the mask plates may be selectively interchanged between said front and rear ends, and interfittin lugs and sockets on said anges and side. wa to hold said mask plates in proper position on the 3? insertion ele ent. 4. In -a ro? film box camera, the combination of a bo -like insertion member having Nparallel side walls, of a pluralit of mask plates, and iianges on the side ges of the 49 mask plates adapted to frictionally gri the side walls at the front andprear ends o said insertion member whereby-the mask plates may be selectively interchanged between said front and rear ends, said flanges having vlugs l 15 extending inwardly from their inner 'faces and the side walls having deprewons constituting sockets to receive the said lugs.

5. In a roll film box camera, the combination of a box-like insertionmember havin 5,0 parallel side walls, of a pluralit of mas plates, flanges on the side edges o the mask plates adapted'qto frictionally ip the side walls at the front and rear engl of said insertion member whereby the-.mask plates may 55 be selectively interchanged between said front and rear ends', lugs extending from the 'edges of said ianges to lie along said side walls, and strips secured to said' side walls and bridging said lugs to form 'sockets there- 50 for.

MAX BALDEVYEG. 

